If I am reading this right, Moses wrote a fairy-tale because the people needed a lesson and were not going to get there with the actual truth of creation, yet they wanted a creation story.
So are we still as backwards as the goat-herder former slaves of Egypt? We can't handle the truth? Shouldn't maybe God issue a retraction of Genesis and maybe leave a monolith on the moon with the actual story written on it (kind of like in 2001: A Space Odyssey) or is He saying "Sorry, Dave. I can't do that!" ? Or in our modern age where we are able to handle more, shouldn't God just put it in our minds how things came to be? Or something else besides a fairy-tale stolen from ignorant cultures to appease more ignorant people.
And whoever wrote the words accredited to Jesus that the world would never "again" be destroyed by flood was just guessing and will be ultimately right because science has amply demonstrated how the story could not have been true in the first place and it could never happen, not the first time and not a second time. I think most people can figure out that the worlds "As in the days ....took them all away" mean that God is going to destroy you all if you don't kiss his ass, not by flood but just the same. It's just a throwback to the God of Armies of the OT.
As long as we are there, if the creation story is a fairy tale stolen from other cultures to appease ignorant people and just teach an object lesson, couldn't the flood be a fairy tale with the same purpose?